Bolt-heading die.



PATENTED MAR. 24, 1908 W. F. DOWERMAN. BOLT HEADING DIB. APPLICATION FILED FEB. 11. 1907.

FIGEJ.

FIGE- mvam'on 1M V 7 Atty I.

WILLIAM F. 'DOWEBMAN, OF

Specification of Letters Patent.

PATENT OFFICE.

PITT SBURG, PENN SYLVAN IA Boar-narrows DIE.

Patented March 24, 1908.

Application filed February 11, 1907. Serial No. 356,790.

T all whom it may concern:

MAN, residing at rittsburg, in the county of Allegheny and State of Pennsylvania, :1 citizen of the United States, have invented or discovered certain new and useful Improve ments in Bolt-Heading Dies, of which improvements the following is a specification.

The invention described herein relates to certain improvements in dies for the manufacture of bol and other like articles. It is customary in forging bolts to employ two die-blocks provided in adjacent faces with grooves for the reception of the stems of the bolts, and rnouuted in suitable slides whereby the block can be moved towards and from each .ihcr. Heretofore these dieblocks have n constructed with the head forming i .ccs integral with the blocks, thus requn mg different blocks for every change inshape orsize of bolt to be made. And further the matrix portions of these blocks are subjected to the greatest wear, so that when the matrix becomes deformed, the whole block must be replaced although other portions are in usable condition.

The invention described herein has for its object a construction wherein the portions of the block in which at least a part of the matrix is formed, is adjustabl'v mounted on the main block and is removable therefrom.

In the accompanying drawing forming a part of this specification, Figure 1 is a view of a forging press showing my improved die blocks secured therein; Fig. 2 1s a sectional view of the die blocks on a plane indicated by the line IIII Fig. 1 Fig. 3 is a side view of one of the blocks; Fig. 4 is a view similar to Fig. 2 showing a construction for the forma- 'tion of an irregularly shaped head; and Fig. 5

is a side view of one of the blocks shown in Fig. 4.

In" the practice of my invention, I employ two blocks, 1 and 1. rectangular in shape, and having in their faces grooves or notches 2 adapted, when. the blocks are brought together in operative position by the'movable head 5 of the machine in which one of the blocks is mounted, to grip the portion of the rod designed to form the stem or shank. The grooves in the different sides may be made of varying dimensions and shapes according to the cross sectional size and shape .of'the stem to be formed.

In order to form the head portions I prowide' angular blocks 3-3 constructed to closely fit two adjacent sides of the main blocks 1 and l and to be held in position on said blocks by the means cn'iploycd for clamping the main blocks in the machine. It is preferred that one of the arms of the angular pieces or blocks should he made a little bit longer than the other and the dimensions of the head to be formed on the bolt will determine which arm is to be placed on the exposed faces of the main blocks. When forming bolts with plain heads, rectangular in contour, the angular pieces are so arranged that plain faces thereof would be adjacent to each other when the angular pieces are arranged on the blocks as shown in Figs. 1., 2 and 3.

In the manufacture of bolts thc cnds of the rods projecting beyond the blocks are pnrtially upset by the action of a reciprocating header and the rods then turned. further up sot, turned again and the upsetting opcra-- tion continued, said blocks 1 and l being separated after each upsetting operation, to permit of the rotation of the rod. In using my die blocks the same operation is per formed. After the head is partially upset and spread by the upsetting dies so as to bear against adjacent faces of the angular blocks, the main dies are separated and the rod with the partially formed hcad turned through an angle of 90 if a rectangular head is to be formed. The blocks arc then closed again and the heading continued.

As shown in Figs. 2, 4. and 5, the angular pieces are provided with means whereby auxiliary blocks 4 may be secured to the angular pieces. In the construction shown, the attachment of the aiik'iliary blocks to the an gular pieces is eflccted by l dove-tailed grooves in the sides of the angular pieces and correspondingly shaped projections on the backs of the auxiliary blocks. 'lhcse auxiliary blocks are generally used when it is desired to form an irrcgu ar shaped head, and the matrix for such head is formed as shown in Figs. 4' and 5, in the auxiliary block.

In the manufacture of bolts, thcfaces of the angular pieces and the portions of the stem are. subjected to the greatest wear. But as these angular pieces can be removed and their plain faces dressed up and the ends of the main block canv also be dressed to remove the worn portions and to bring the whole to a uniform surface, such wear is not detrimental and does not involve the throw;

main block adjacent to the grooves for the blocks.

ing away of the Whole die block a portion of screws 8 to the head 5 and anvil 6,-and bearlng at one end on the auxiliary blocks, preferably through the medium of screws 9. By loosening the screws 8 and 9 one or both, the auxiliary blocks can be ad usted to any desired position onthe main blocks thus permitting the formation of a large variety of shapes and sizes of heads on bolts, with the same main and auxiliary blocks.

The'improvement described and claimed herein pertains particularlytothat class of forging machines, having what ht be termed an open matrix, z'. e; a matrix aving two oppositely, disposed side Walls. In operating such resses the bar is gri ped between the main locks' and the en of the bar spread by the header, the spreading being limited in two directions by the auxiliary then separated and the bar turned, the angle of. turning be' 4 dependenton the shape of the head to be firmed. .This turning brings the ortions which were not confined as rear spreading, into position to be acted on y the'auxiliary block. The main and auxiliary blocks are then brought together, the

n main blocks again gripping the rod, and the auxiliary blocks squeezing the upset portion.

The header again acts on the end of the rod block The main and auxiliary blocks, which are carried by the main blocks, are

to effect a further shaping of the head. These operations are continued till the desired headhas been formed. I claim herein as my invention:

1. Bolt heading dies having in combination blocks rovided with means for holding the rod to e headed and auxiliary blocks forming two oppositely disposed sides or portions 0 the head shaping matrix adapted to be adjusted with reference to each other on the main blocks.

2. Bolt headin dies having in combination'blocks rovi ed-with grooves for the reception of the rod to be headed, and angular blocks bearing onadjacent sides of the main blocks, each portion of the angular blocks bein'g'adapted to form a side or portion of a two sided head sha ing matrix.

3. Bolt-hea in dies having in combination blocks provi' ed with mating grooves for the rece tion of the rod tobe headed, interchangea 1e blocks removably held against the main blocks on o posite sides of the rod a receiving grooves j t eiro posing surfaces adapted to form a two si ed head-shaping matrix and other sha ing dies on-"theopposite sides of the interc angeable blocks, substantially as set forth.

p 4. improved die block having suitable rod gripping means in combination with two legs angularly arranged each leg adapted to form on either face or both faces one side of a two-sided bolt heading matrix.

In testimony whereof, I have hereunto set my hand. I

WILLIAM F. DOWERMAN.

VVitnesses CHARLES BARNETT; Frames E. Womgi 

